raspivid -v -g 50 -pf baseline -p 0,0,640,360 -t 0 \
  -w 640 -h 360 -b 500000 -ISO 3200 -e -ih -o - | \
  ffmpeg -y -i - -ac 1 -ar 8k -f s16le -i /dev/zero \
  -acodec nellymoser -ab 8k \
  -vcodec copy -f flv rtmp://192.168.1.50/myapp/test
